5、The main principle of this thesis is to implement USB host system function in the embedded system without operating system, establish FAT file system on USB flash disk and implement the read and write function to USB flash disk.
6、USB flash disk and portable hard disk have been used as common removable storage devices, which brought a great convenience to users. However, they also present a new security challenge to government departments, companies and individuals who have high confidentiality requirements.
7、Finally, a data analyse and management software is developed with VB language. It can load mass datas from the USB flash disk to the database and then analyse and manage them effectively. The aim of preventing electric power larceny is carried out.